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The OneFS ‘isi_drivenum’ CLI command can be used to verify the drive block sizes in a node. For example, below is the output for a PowerScale Gen6 H-series node, showing drive bay 1 containing an SSD with 4KB physical formatting and 512byte logical sizes, and bays A to E consisting of hard disks (HDDs) with both 4KB logical and physical formatting.
# isi_drivenum -bz
Bay 1 Physical Block Size: 4096 Logical Block Size: 512
Bay 2 Physical Block Size: N/A Logical Block Size: N/A
Bay A0 Physical Block Size: 4096 Logical Block Size: 4096
Bay A1 Physical Block Size: 4096 Logical Block Size: 4096
Bay A2 Physical Block Size: 4096 Logical Block Size: 4096
Bay B0 Physical Block Size: 4096 Logical Block Size: 4096
Bay B1 Physical Block Size: 4096 Logical Block Size: 4096
Bay B2 Physical Block Size: 4096 Logical Block Size: 4096
Bay C0 Physical Block Size: 4096 Logical Block Size: 4096
Bay C1 Physical Block Size: 4096 Logical Block Size: 4096
Bay C2 Physical Block Size: 4096 Logical Block Size: 4096
Bay D0 Physical Block Size: 4096 Logical Block Size: 4096
Bay D1 Physical Block Size: 4096 Logical Block Size: 4096
Bay D2 Physical Block Size: 4096 Logical Block Size: 4096
Bay E0 Physical Block Size: 4096 Logical Block Size: 4096
Bay E1 Physical Block Size: 4096 Logical Block Size: 4096
Bay E2 Physical Block Size: 4096 Logical Block Size: 4096
Note: The SSD disk pools used in PowerScale hybrid nodes that are configured for meta-read or meta-write SSD strategies use 512 byte inodes by default. This can significantly save space on these pools, as they often have limited capacity. However, it will prevent data inlining from occurring. By contrast, PowerScale all-flash nodepools are configured by default for 8KB inodes.
The OneFS ‘isi get’ CLI command provides a convenient method to verify which size inodes are in use in a given node pool. The command’s output includes both the inode mirrors size and the inline status of a file. More information about the ‘isi get’ utility is provided in Efficiency reporting.